Metalspinner's Puzzleknot | Artifact | | When Metalspinner's Puzzleknot enters the battlefield, you draw a card and you lose 1 life.
{2}{B}, Sacrifice Metalspinner's Puzzleknot: You draw a card and you lose 1 life. | Vincent Proce
Prakhata Pillar-Bug | Artifact Creature | Insect | {B}: Prakhata Pillar-Bug gains lifelink until end of turn. (Damage dealt by this creature also causes you to gain that much life.) | Jason Felix
Scrapheap Scrounger | Artifact Creature | Construct | Scrapheap Scrounger can't block.
{1}{B}, Exile another creature card from your graveyard: Return Scrapheap Scrounger from your graveyard to the battlefield. | Jason A. Engle